qtest: Don't compile qtest accel on non-POSIX systems

qtest_available() will always return 0 on non-POSIX systems.
It's simpler to just not compile the accelerator code on those
systems instead of relying on the AccelClass::available function.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20190422210448.2488-3-ehabkost@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> [on mingw64]
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

accel/Makefile.objs

@@ -1,5 +1,5 @@
 obj-$(CONFIG_SOFTMMU) += accel.o
-obj-$(CONFIG_SOFTMMU) += qtest.o
+obj-$(call land,$(CONFIG_SOFTMMU),$(CONFIG_POSIX)) += qtest.o
 obj-$(CONFIG_KVM) += kvm/
 obj-$(CONFIG_TCG) += tcg/
 obj-y += stubs/

accel/qtest.c

@@ -34,7 +34,6 @@ static void qtest_accel_class_init(ObjectClass *oc, void *data)
 {
     AccelClass *ac = ACCEL_CLASS(oc);
     ac->name = "QTest";
-    ac->available = qtest_available;
     ac->init_machine = qtest_init_accel;
     ac->allowed = &qtest_allowed;
 }

include/sysemu/qtest.h

@@ -27,13 +27,4 @@ bool qtest_driver(void);
 
 void qtest_init(const char *qtest_chrdev, const char *qtest_log, Error **errp);
 
-static inline int qtest_available(void)
-{
-#ifdef CONFIG_POSIX
-    return 1;
-#else
-    return 0;
-#endif
-}
-
 #endif